Malicious PDF — malware analysis report

Static analysis result for SHA-256 615f159316dbbbae…

MALICIOUS

PDF

41.2 KB Created: 2020-08-09 17:35:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e66cc1b17d1390c57e6b20a2a2ba5017 SHA-1: fcb56e584e7a456f22a17d52a402651376e1f2d5 SHA-256: 615f159316dbbbaee4453df0fdb0e57bd00dbfe01616c1247b2f067b61b045c1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains references to the malicious URL and other URLs hosted on Shopify, suggesting a link farm or SEO spam campaign. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/pify?keyword=types+network+topology+pdf
    • http://sanamiraw.webuyhomeslauderdale.com/uploads/1/3/2/6/132682883/miwugajowokitupoka.pdf
    • http://files.currantcreekoutfitters.net/uploads/1/3/2/6/132681836/wapogesunidikum.pdf
    • http://files.sandcastletreasures.com/uploads/1/3/1/4/131409264/1ea2d8ce23ea.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9445/0078/files/30508883868.pdf
    • https://cdn.shopify.com/s/files/1/0431/6200/9760/files/wifub.pdf
    • https://cdn.shopify.com/s/files/1/0440/6411/2805/files/dutaneperalunajukokuwaju.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/central_park_guillaume_musso_english.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bofudajix.pdf
    • https://cdn.shopify.com/s/files/1/0428/9629/4051/files/lipossomas_de_ceramidas.pdf
    • https://cdn.shopify.com/s/files/1/0433/9856/1948/files/aphorismen_zur_lebensweisheit_schopenhauer.pdf
    • https://cdn.shopify.com/s/files/1/0432/3534/4539/files/basic_english_usage_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/3220/7782/files/days_of_the_week_worksheets_grade_1.pdf
    • https://cdn.shopify.com/s/files/1/0429/8607/8369/files/longman_academic_reading_series.pdf
    • https://cdn.shopify.com/s/files/1/0428/2161/5772/files/fopil.pdf
    • https://cdn.shopify.com/s/files/1/0437/5783/0298/files/49455672112.pdf
    • https://cdn.shopify.com/s/files/1/0429/7300/3939/files/posag.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9805/files/57161970126.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006445.bin
4ff999d1ad9213b00a3a6cc8129142537b2a0cfe9621758fc29ed530cc3f9c84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6445 5208 bytes
font_01_sfnt_off0000762c.bin
e4974da0f14e022da4f457dd0025b42b1be02df1b24315d954cbbada43666e91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x762C 9756 bytes

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